206646 has 32 divisors (see below), whose sum is σ = 470016. Its totient is φ = 60000.

The previous prime is 206641. The next prime is 206651. The reversal of 206646 is 646602.

It is an interprime number because it is at equal distance from previous prime (206641) and next prime (206651).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1996 + ... + 2096.

It is an arithmetic number, because the mean of its divisors is an integer number (14688).

2²⁰⁶⁶⁴⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 206646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235008).

206646 is an abundant number, since it is smaller than the sum of its proper divisors (263370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

206646 is a wasteful number, since it uses less digits than its factorization.

206646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 206646 is about 454.5833256951. The cubic root of 206646 is about 59.1210766527.

It can be divided in two parts, 2066 and 46, that added together give a palindrome (2112).

The spelling of 206646 in words is "two hundred six thousand, six hundred forty-six".